Critical infrastructure represents a medium of national and international importance whose destruction, temporary or permanent disruption in process activities, would seriously endanger or weaken national and public safety, economic and social prosperity. Beside the internal threats, critical infrastructure is exposed to natural, technical-technological and anthropogenic threats, where terrorism is recognized to be one of the most unpredictable and dangerous sources of threats to the critical infrastructures. For that reason countries are responsible for the implementation and improvement of the critical infrastructures' protection and resilience to ensure survival, the development and advancement of individuals' and the social community, domestic and foreign economic subjects on their soil and, in partnership, achieving stability and safety of other countries. The goal of this work is to analyze how the Republic of Croatia has, so far, legally, regulatory and operationally developed protection and resilience of the national critical infrastructure, and give recommendations with regards to necessary steps in the continuation of the said process.